Accurate Modulation of Mass Ratio on Electrodes of Ruthenium Oxide//Polyaniline Supercapacitor for Improving Energy Density

Xu, Weinan; Gu, Dawei; Yu, Jie‐Zhong; Jiang, Hongyi; Sun, Hong-Shun; Wang, Lei; Shen, Lin

doi:10.1149/2.0741910jes

Cited by 13 publications

(13 citation statements)

References 52 publications

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“…Note that redox reactions always occur in specific potential windows. Therefore, the specific capacitance of electrodes dominated by PSC mechanism would be related to the potential . To investigate the relationship between specific capacitance and potential, a stepwise CV approach is proposed herein, in which the CV measurements are performed within a series of continuous potential window.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the relationship between the specific capacitance and electrode potential (Figure c), the electric charge on the electrodes can be determined according to Eqs. (3) and :

true Q_{+} = \int_{U_{0}}^{U_{+}} C_{S +} m_{+} d U

true Q_{-} = \int_{U_{-}}^{U_{0}} C_{S -} m_{-} d U

…”

Section: Resultsmentioning

confidence: 99%

“…Hence, the potential obviously affects the specific capacitance of PSC materials, which is completely different from EDLC electrodes. In other words, the specific capacitance of PSC electrodes is obviously related to the potential …”

Section: Introductionmentioning

confidence: 99%

“…The increase in

C_{S C}

is usually achieved by improving the specific capacitance of the electrodes, such as specific surface area or by introduction of electrochemical functional groups into the active electrode materials . To extend the voltage window of SC, the effect of electrode mass on voltage window was studied by many research groups . In addition, the improvement of electrolyte in SC can also effectively extend the voltage window .…”

Section: Introductionmentioning

confidence: 99%

“…In other words, the specific capacitance of PSC electrodes is obviously related to the potential. [10,11] To improve the energy capacity ðE SC ) of SC, two methods have been so far proposed. The first consists of elevating the capacitance (C SC ) and the second is based on extending the working voltage window of SC (V) according to the equation: [12] The increase in C SC is usually achieved by improving the specific capacitance of the electrodes, such as specific surface area or by introduction of electrochemical functional groups into the active electrode materials.…”

Section: Introductionmentioning

confidence: 99%

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Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Wang

Guo

et al. 2020

ChemElectroChem

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In this study, a stepwise cyclic voltammetry approach was proposed to clarify the potential dependence of specific capacitance for reduced graphene oxide and ruthenium oxide electrodes. Based on the relationship between specific capacitance and potential, the working voltage window and energy density of RuO2//RuO2 supercapacitors (SCs) were maximized by modulating the mass ratio. The working voltage window of RuO2//RuO2 with a mass ratio of 2.03 (close to optimum mass ratio m+/m-OPTM=2.04 ) was extended by about 188 % when compared to that calculated at a mass ratio of 0.56. The former was equivalent to a 304 % increase in energy density. In addition, the source of wasted potential window of electrodes on RuO2//RuO2 was investigated in an effort to design and produce better SCs.

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Section: Resultsmentioning

confidence: 99%

“…Based on the relationship between the specific capacitance and electrode potential (Figure c), the electric charge on the electrodes can be determined according to Eqs. (3) and :

true Q_{+} = \int_{U_{0}}^{U_{+}} C_{S +} m_{+} d U

true Q_{-} = \int_{U_{-}}^{U_{0}} C_{S -} m_{-} d U

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The increase in

C_{S C}

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Wang

Guo

et al. 2020

ChemElectroChem

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Covalent Organic Frameworks as Negative Electrodes for High‐Performance Asymmetric Supercapacitors

Kandambeth

Jia

et al. 2020

Advanced Energy Materials

136

120

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Supercapacitors (SCs) are important energy storage devices that are increasingly playing an important role in various applications. [1-6] Though SCs can offer high power density, they have lower energy density in comparison to batteries. [1] The high power density makes them suitable for applications such as uninterruptible power supply (UPS), portable tools, rubber-tired gantry crane, and emergency doors on airplanes. [1,2] However, in order to deploy SCs in automotive and grid storage applications, their energy density needs to be significantly uplifted. [7,8] To enhance the energy density of SCs, which is calculated using this equation (E = 0.5 C V 2), either the specific capacitance (C) or cell voltage (V) needs to be improved. [2,9] The C values of the SC device can be improved by tuning the intrinsic properties of the electrode material. [10] For example, employing pseudocapacitive electrode materials is an effective strategy to enhance the specific capacitance (C) of the SC. [8] Pseudocapacitive materials, in general, show high capacitance values in comparison to electrical double layer capacitor (EDLC) based materials due to their fast reversible electron transfer redox reactions. [8] On the other hand, the cell voltage (V), the second major factor which influences the energy density, is greatly controlled by device engineering. [8,11] Organic electrolyte based SC devices usually offer a higher voltage window in comparison to aqueous devices. [8,11] However, the former suffers from some disadvantages such as low ionic mobility, high cost, toxicity, and not being environmentally benign. [12] On the other hand, aqueous electrolyte based SCs go without the aforementioned disadvantages, but the conventional symmetric SCs with aqueous electrolyte are hampered by low voltage windows. [12] In case of aqueous electrolyte SCs, the voltage window can be significantly improved by constructing asymmetric supercapacitors (ASCs). [12,13] In ASCs, two different electrode materials are used separately for the negative and positive electrodes. [12,13] The complementary potential windows of the individual electrodes enable the ASC device to cross the thermodynamic break New covalent organic frameworks (COFs), encompassing redox-functionalized moieties and an aza-fused π-conjugated system, are designed, synthesized, and deployed as negative electrodes in asymmetric supercapacitors (ASC), for the first time. The Hex-Aza-COFs are synthesized based on the solvothermal condensation reaction of cyclohexanehexone and redox-functionalized aromatic tetramines with benzoquinone (Hex-Aza-COF-2) or phenazine (Hex-Aza-COF-3). The redox-functionalized Hex-Aza-COFs show a specific capacitance of 585 F g −1 for Hex-Aza-COF-2 and 663 F g −1 for Hex-Aza-COF-3 in a three-electrode configuration. These values are the highest among reported COF materials and are comparable with state-of-the-art pseudocapacitive electrodes. The Hex-Aza-COFs exhibit a wide voltage window (0 to −1.0 V), which allow the construction of a two-electrode ASC device b...

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Supercapacitor performances of RuO₂/MWCNT, RuO₂/Fullerene nanocomposites

et al. 2019

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In this study, RuO2/Fullerene and RuO2/MWCNT nanocomposites were synthesized to use as an electroactive materials in symmetric supercapacitor device performances. The materials were examined via Fourier transform infrared spectroscopy‐attenuated total reflectance (FTIR‐ATR), thermo‐gravimetric analysis (TGA‐DTA), scanning electron microscopy‐energy dispersive X‐ray analysis (SEM‐EDX), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). The RuO2/MWCNT and RuO2/Fullerene nanocomposite electrodes show good electrochemical performances. For instance, the highest specific capacitance of RuO2/Fullerene and RuO2/MWCNT electrodes reaches Csp = 3895.11 and 1662.19 F/g at 1 mV/s within the potential range of 0.8 V in 1 M H2SO4 solution. RuO2/MWCNT and RuO2/Fullerene nanocomposites have good cycle stability ~100% specific capacitance at [RuO2]o/[MWCNT]o = 1:1; 2:1 and [RuO2]o/[Fullerene]o = 2:1, respectively. The different equivalent circuit models of LR1Q(C1R2) and LR1(Q1R2)(Q2R3) were used to interpret EIS data.

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Accurate Modulation of Mass Ratio on Electrodes of Ruthenium Oxide//Polyaniline Supercapacitor for Improving Energy Density

Cited by 13 publications

References 52 publications

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Covalent Organic Frameworks as Negative Electrodes for High‐Performance Asymmetric Supercapacitors

Supercapacitor performances of RuO₂/MWCNT, RuO₂/Fullerene nanocomposites

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Accurate Modulation of Mass Ratio on Electrodes of Ruthenium Oxide//Polyaniline Supercapacitor for Improving Energy Density

Cited by 13 publications

References 52 publications

Maximized Energy Density of RuO2//RuO2 Supercapacitors through Potential Dependence of Specific Capacitance

Maximized Energy Density of RuO2//RuO2 Supercapacitors through Potential Dependence of Specific Capacitance

Covalent Organic Frameworks as Negative Electrodes for High‐Performance Asymmetric Supercapacitors

Supercapacitor performances of RuO2/MWCNT, RuO2/Fullerene nanocomposites

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About

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Supercapacitor performances of RuO₂/MWCNT, RuO₂/Fullerene nanocomposites